Selection for drought tolerance increases maize yields across a range of nitrogen levels
It is not known whether selection for improved tolerance to a specific abiotic stress leads to correlated changes in performance under other stresses. Drought and N deficiency are important constraints to production in the tropics. We examined the effect of selection for drought tolerance on perform...
| Autores principales: | , , |
|---|---|
| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
1999
|
| Acceso en línea: | https://hdl.handle.net/10568/167144 |
| _version_ | 1855536163862872064 |
|---|---|
| author | Bänziger, M. Edmeades, G.O. Lafitte, H.R. |
| author_browse | Bänziger, M. Edmeades, G.O. Lafitte, H.R. |
| author_facet | Bänziger, M. Edmeades, G.O. Lafitte, H.R. |
| author_sort | Bänziger, M. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | It is not known whether selection for improved tolerance to a specific abiotic stress leads to correlated changes in performance under other stresses. Drought and N deficiency are important constraints to production in the tropics. We examined the effect of selection for drought tolerance on performance of tropical maize (Zea mays L.) under a range of N levels. Original and advanced selections of four populations, improved for tolerance to midseason drought for two to eight recurrent selection cycles each, were evaluated in two experiments under severe N stress, one experiment under medium N stress, and two well‐fertilized experiments. Nitrogen accumulated in the aboveground biomass at maturity averaged 52, 63, 105, 151, and 163 kg N ha−1 in the five experiments, and grain yields of 3.0, 2.9, 5.2, 6.0, and 6.5 Mg ha−1 were obtained. Selection for tolerance to midseason drought stress increased grain yields by an average of 86 kg ha−1 yr−1 with nonsignificantly larger gains under severe N stress (100 kg ha−1 yr−1). Drought‐tolerant selections had increased biomass and N accumulation at maturity, the changes being largest under severe N stress. Additionally, drought‐tolerant selection cycles were associated with delayed leaf senescence and an increased or unchanged N harvest index, indicating that leaf N was used more efficiently for grain production. Selection for tolerance to midseason drought stress appears to increase grain yield across a range of N stress levels and may lead to morphological and physiological changes that are of particular advantage under N stress. |
| format | Journal Article |
| id | CGSpace167144 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1999 |
| publishDateRange | 1999 |
| publishDateSort | 1999 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1671442025-05-14T10:39:54Z Selection for drought tolerance increases maize yields across a range of nitrogen levels Bänziger, M. Edmeades, G.O. Lafitte, H.R. It is not known whether selection for improved tolerance to a specific abiotic stress leads to correlated changes in performance under other stresses. Drought and N deficiency are important constraints to production in the tropics. We examined the effect of selection for drought tolerance on performance of tropical maize (Zea mays L.) under a range of N levels. Original and advanced selections of four populations, improved for tolerance to midseason drought for two to eight recurrent selection cycles each, were evaluated in two experiments under severe N stress, one experiment under medium N stress, and two well‐fertilized experiments. Nitrogen accumulated in the aboveground biomass at maturity averaged 52, 63, 105, 151, and 163 kg N ha−1 in the five experiments, and grain yields of 3.0, 2.9, 5.2, 6.0, and 6.5 Mg ha−1 were obtained. Selection for tolerance to midseason drought stress increased grain yields by an average of 86 kg ha−1 yr−1 with nonsignificantly larger gains under severe N stress (100 kg ha−1 yr−1). Drought‐tolerant selections had increased biomass and N accumulation at maturity, the changes being largest under severe N stress. Additionally, drought‐tolerant selection cycles were associated with delayed leaf senescence and an increased or unchanged N harvest index, indicating that leaf N was used more efficiently for grain production. Selection for tolerance to midseason drought stress appears to increase grain yield across a range of N stress levels and may lead to morphological and physiological changes that are of particular advantage under N stress. 1999-07 2024-12-19T12:57:03Z 2024-12-19T12:57:03Z Journal Article https://hdl.handle.net/10568/167144 en Wiley Bänziger, M.; Edmeades, G. O. and Lafitte, H. R. 1999. Selection for drought tolerance increases maize yields across a range of nitrogen levels. Crop Science, Volume 39 no. 4 p. 1035-1040 |
| spellingShingle | Bänziger, M. Edmeades, G.O. Lafitte, H.R. Selection for drought tolerance increases maize yields across a range of nitrogen levels |
| title | Selection for drought tolerance increases maize yields across a range of nitrogen levels |
| title_full | Selection for drought tolerance increases maize yields across a range of nitrogen levels |
| title_fullStr | Selection for drought tolerance increases maize yields across a range of nitrogen levels |
| title_full_unstemmed | Selection for drought tolerance increases maize yields across a range of nitrogen levels |
| title_short | Selection for drought tolerance increases maize yields across a range of nitrogen levels |
| title_sort | selection for drought tolerance increases maize yields across a range of nitrogen levels |
| url | https://hdl.handle.net/10568/167144 |
| work_keys_str_mv | AT banzigerm selectionfordroughttoleranceincreasesmaizeyieldsacrossarangeofnitrogenlevels AT edmeadesgo selectionfordroughttoleranceincreasesmaizeyieldsacrossarangeofnitrogenlevels AT lafittehr selectionfordroughttoleranceincreasesmaizeyieldsacrossarangeofnitrogenlevels |